Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Elatine heterandra

Higher Taxonomy
Family: ElatinaceaeView DescriptionDichotomous Key

Habit: Annual, short-lived perennial herb, in or near water; roots fibrous, from taproot or not, generally from lower leaf axils also. Stem: generally soft. Leaf: simple, opposite, +- 4-ranked; stipules scarious. Inflorescence: flowers in upper axils, 1 or few in clusters. Flower: small, inconspicuous, radial, bisexual; sepals, petals 2--5, equal in number, generally free; ovary spheric, styles 3--5, short. Fruit: capsule, septicidal, +- spheric, ovoid, or depressed-ovoid, walls thin; chambers 2--5, each several to many-seeded. Seed: small; surface net-like or glossy.
Genera In Family: 2 genera, 50 species: +- worldwide.
eFlora Treatment Author: Gordon C. Tucker & Evanielis U. Grissom
Scientific Editor: Thomas J. Rosatti.
Genus: ElatineView DescriptionDichotomous Key

Common Name: WATERWORT
Stem: Erect underwater, +- prostrate on wet ground, branched or not; base not woody. Leaf: petiole < 1/3 blade, flat, +- blade-like; blades narrow-elliptic to +- round, +- entire, bases wedge-shaped to +- round, tips round. Inflorescence: flowers 1(2) per node. Flower: sepals, petals wide-elliptic, membranous; sepals pale green; petals pale green-white; stamens (1) 3, 6, 8, filaments 1/2 × to +- equal petals, anthers wide-ovoid; styles 3--4. Fruit: +- spheric or depressed-ovoid; chambers 3--4, each 3--15-seeded; pedicel generally +- 0. Seed: +- visible through fruit wall, elliptic, straight or curved, brown to yellow-brown; surface net-like due to ridges between +- linear rows of pits.
Species In Genus: +- 25 species: worldwide. Etymology: (Greek: fir tree, from a European species that suggests such a plant in miniature) Note: At least 20× magnification needed for pits on seeds.

Elatine heterandra H. Mason
Stem: decumbent, 2--5 cm. Leaf: obovate to wide-oblong-elliptic; petiole +- 1/4 blade. Inflorescence: flowers 1 per node. Flower: sepals 2, +- equal; petals 3, ovate; stamens (1) 6 (if 3, opposite petals). Fruit: chambers 3. Seed: wide-elliptic, curved 15--30°; pits 12--16 per row, wider than long.
Ecology: Pond edges; Elevation: 1000--1500 m. Bioregional Distribution: NCoR, SN. Flowering Time: Apr--Jul
eFlora Treatment Author: Gordon C. Tucker & Evanielis U. Grissom
Jepson Online Interchange

Previous taxon: Elatine chilensis
Next taxon: Elatine rubella

Name Search


Citation for this treatment: Gordon C. Tucker & Evanielis U. Grissom 2016. Elatine heterandra, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 24, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on October 24, 2016.

Geographic subdivisions for Elatine heterandra:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.